Monday, July 12, 2021

10 july 2021

Seeing was predicted to be good so I observed with hopes it would improve through the night.  I would check some challenging pair at high altitude every so often, but it was never steady enough.  So I kept the 7-inch mask on most of the night, still a good night.

STF1934 AB: 178; 205x: Faint, wide, slight mag difference, reddish color stars (Spectral G5, yellow)
15h 17m 22.50s +43° 47' 36.9" P.A. 13.00 sep 9.8 mag 9.46,9.63 Sp G5 dist. 114.29 pc (372.81 l.y.) 

STF1983 AB: 178; 205x" Faint white star with wide 2 delta fainter companion, seen with averted vision at first but then can easily hold it direct, 
15h 51m 57.93s +35° 27' 39.0" P.A. 64.00 sep 14.1 mag 10.19,11.74 Sp K2

AGC 7 AB: 178; 205x: Epsilon CrB.  I'm amazed I can get a tiny pinpoint to the north at low magnification, it holds steady just out of A's diffraction.  A is a light yellow-orange.  Spectral K2IIIab (yellow-orange).  Insufficient Gaia data on the secondary, but they put the magnitudes at 3.75/9.99 vs WDS following:
15h 57m 35.30s +26° 52' 40.9" P.A. 10.00 sep 2.0 mag 4.13,12.60 Sp K2IIIab dist. 67.89 pc (221.46 l.y.)

STT 293 AB: 178; 205x: White A and faint wide B.  WDS says physical, and it does overlap parallax range and is 840 AU separated.  No radial velocity for the B star.
15h 15m 27.22s +22° 32' 57.4" P.A. 345.00 sep 11.1 mag 8.55,11.93 Sp F8 dist. 69.54 pc (226.84 l.y.)

HO 547 AB: 178; 205x: The B star was first detected at 20-inch, but with 7-inch it was very difficult averted vision only.  WDS says physical and it does overlap parallax and 256 AU separation; no radial velocity for the B star.
15h 16m 25.62s +16° 47' 39.4" P.A. 290.00 sep 5.5 mag 7.75,11.45 Sp G0 dist. 41.91 pc (136.71 l.y.)

STF1930 AB: 178; 205x: Light yellow-white A and wide 3 delta B.  WDS says physical and this is correct: 74% parallax overlap, 289 AU separation, and the radial velocity is less than the escape velocity. 
15h 19m 18.79s +01° 45' 55.5" P.A. 36.00 sep 11.1 mag 5.06,10.11 Sp F8V dist. 25.38 pc (82.79 l.y.)

BU 32 AB: 178; 205x: Bright yellow A and faint B hangs there outside the diffraction, around 3".  WDS says physical and it probably is: 41% parallax range overlap, 253 AU separation
15h 21m 02.00s +00° 42' 55.2" P.A. 23.00 sep 3.4 mag 5.53,8.78 Sp K2III dist. 73.37 pc (239.33 l.y.)

STF3092 AB: 178; 205x: Faint pair, B can barely be seen with direct visions, brightens with averted.  Wide.   WDS says physical but there is no parallax range overlap; the proper motions are similar so these are comoving only.
15h 21m 45.10s -02° 00' 50.4" P.A. 166.00 sep 14.1 mag 9.17,11.70 Sp G5

HO 264 AB: 178; 445x:  Difficult with 70inch.  Suspected at 205x as a brightening with averted vision, more certain split and visibility with 445x, but still averted vision only.  WDS says physical but there is no overlap in the parallax range; proper motions are a little divergent so it's not certain these are comoving or not.
15h 21m 54.91s +16° 30' 08.0" P.A. 298.00 sep 1.2 mag 8.24,11.01 Sp F4V dist. 79.05 pc (257.86 l.y.)

STF1943 AB: 178; 205x: Easy wide 1 delta.  WDS says physical, and there is strong 92% parallax overlap, only 450 AU separation, however the delta in radial velocity exceeds the escape velocity, so this is not a gravitationally bound pair.
15h 27m 37.68s +05° 22' 06.2" P.A. 148.00 sep 5.1 mag 9.29,9.58 Sp G5

STF1944 AB: 178; 445x: Hairline split wit seeing, significant magnitude difference, difficult.  Physical with a 1030-year period, on the historical measures alone since there is no Gaia data for the secondary.  It will continue to tighten to 0.4" by 2090, moving in the fastest part of its orbit.
15h 27m 42.14s +06° 06' 04.5" P.A. 292.20 sep 0.6 mag 8.32,8.79 Sp F8 dist. 196.08 pc (639.61 l.y.)

STF1952 AB-C: 178; 205x: Very wide one delta
15h 31m 54.80s +09° 39' 39.2" P.A. 220.00 sep 16.1 mag 8.70,10.12 Sp F8 dist. 187.27 pc (610.87 l.y.)

STF1953 AB: 178; 205x: Pretty wide 1 delta.  WDS says physical and this is probably correct: 14% parallax overlap, 2,044 AU separation, however no radial velocity for the primary.
15h 32m 57.15s +05° 30' 32.3" P.A. 253.00 sep 6.7 mag 9.65,10.58 Sp F5 dist. 641.03 pc (2091.04 l.y.)

AG 198 AB: 178; 205x: Wow!  Very fine direct vision, both disks are clear, white stars, 2 delta.  WDS uncertain of binarity, and I find they are not: no parallax range overlap, and the escape velocity exceeds the radial velocity. 
15h 45m 20.23s +04° 31' 56.5" P.A. 144.00 sep 2.2 mag 9.18,10.12 Sp F0 dist. 126.26 pc (411.86 l.y.)

STF1968 AB: 178; 205x: Easy wide 1 delta.  WDS says physical, and while there is 28% parallax overlap and 1,314 AU, the escape velocity is almost twice the radial velocity, so if they are bound they won't be for long.
15h 45m 23.29s -01° 23' 29.3" P.A. 93.00 sep 14.4 mag 9.49,10.49 Sp G5V+K0

BU 240 AB: 178; 205x: Very like AG 198 in appearance: 2 delta mag very close but very plain, excellent.  Unfortunately this is just a line of sight pair, there is no overlap of the parallax ranges.
15h 45m 31.73s +04° 01' 37.1" P.A. 131.00 sep 1.9 mag 8.78,10.16 Sp G5

STF1974 AB: 178; 205x: White stars, <1 delta mag, close but good separation <3".  24% parallax range overlap, 343 AU separation, so chances are good this is gravitationally bound.
15h 49m 11.99s -03° 14' 01.1" P.A. 159.00 sep 2.5 mag 8.95,9.12 Sp A0

STF3126 AB: 178; 205x: Challenging: near equal stars, one fades with seeing then when settled it makes a nice close around 2" split with the other.  This is gravitationally bound: 25% parallax overlap, 378 AU separation, and the escape velocity is less than the radial velocity difference.
15h 50m 04.27s -03° 10' 38.5" P.A. 279.00 sep 2.3 mag 10.39,10.29 Sp F5

STF1985 AB: 178; 205x: Ice blue color A and slightly red B, >1 delta mag, pretty wide.  2307.2358-year period, it will slowly widen.
15h 55m 54.63s -02° 09' 51.3" P.A. 354.80 sep 6.0 mag 7.03,8.65 Sp F8V dist. 36.9 pc (120.37 l.y.)
FOX 193 AB: 178; 205: Faint, wide, slight magnitude difference, white.  No parallax overlap.
16h 01m 37.81s +10° 24' 21.7" P.A. 18.00 sep 10.9 mag 10.84,11.50 Sp G0

STF2041 AB: 205x: Pretty tough, white A and nearly 3 delta mag yellow B, quite close, need seeing to settle.  No parallax overlap.
16h 21m 47.96s +01° 12' 56.4" P.A. 1.00 sep 2.6 mag 7.51,10.54 Sp K0

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